Bell for blast furnaces



Sept 19, 1933. E. P. EVERHARD BELL FOR BLAST FURNACES Filed April 9, 1931 at'ented Sept'. 19, 1933 PATENT oFFIcs BELL IFoa BLAST FURNAcEs f" Edgar P. Everhard, Chicago,` Ill., .assigner to Freyn Engineering Company, Chicago, Ill., a

corporation of Maine Application April 9, 1931. Serial No. 528,735

2 Claims.

The present invention relates to improvements r present diiculties in the process of casting as I Well as `difliculties in shipment and in repairs.

An object of the present invention is to provide a blast furnace bell made up of a plurality of parts, each of which is relatively simple to manufacture, which parts are also simple to assemble into an operative structure. r

A further object is to provide a multiple piece blast furnace bell in which the matter of repairs is simpled.

A further object is to provide an efficient blast M furnace bell which may be manufactured at a minimum cost.

Further objects will appear as the description proceeds.

Referring to the drawing- Figure 1 is a top plan view of one embodiment of the present invention;

Figure 2 is a sectional view taken along the plane indicated by the arrows 2--2 of Figure 1;

Figure 3 is an enlarged View of a part of the structure shown in Figure 2;'

Figure 4 is a side view of a Wedging member or pin and cooperating key shown in operative positionin the practice of the present invention; and

Figure 5 is a view illustrating said wedge pin in operative relationship with the remainder of the bell.

The blast furnace bell chosen for illustration comprises an upper bell-shaped portion and a bottom portion 11. The upper portion 10 will preferably be an integral member and will be provided with the usual structure at its center by means of which the bell may be hung in the customary way. For this purpose the upper portion 10 is provided with the downwardly extending boss 12 provided with the strengthening ribs 13-13. The boss 12 may be provided with the pair of apertures 14-14 for the reception of a holding means for a cable (not shown) for controlling the bell.

The bottom portion 11 of the bell may be made in one piece if desired, but preferably will be made in a plurality of pieces bolted together. In the illustrated embodiment of the present invention the bottom portion 11 is made up of four sections 15-15, which sections are provided at their extremities with the inwardly extending flanges 16-16. When the sections 15-15 are in assembledrelationship with one another the flanges 16-16 are disposed in radial relationship to a common center. Bolts 17-17 are provided which cooperate with the flanges 16--16 to hold the sections 15-15 in assembled relationship to provide an annular tapered member. The lower extremity of the upper portion l0 is provided with 60 the outwardly presented conical surface 18, which preferably should be a finished surface. The upper portion of the bottom portion 11 is provided with the inwardly presented conical surface 19 adapted to cooperate with the conical surface 65 18. The upper portion 10 of the bell is provided with a plurality of apertures 20-20 for the reception of pins 21-21. Said pins 21-21 have wedge-shaped head portions 22 adapted to have wedging relationship between the upper extremi- 'Z0 ty of the bottom portion l1 and the shoulder 23 of the upper portion 10 of the bell. Taper keys 24-24 are provided for holding the wedge pins 21-21 in operative position.

The top portion 10 and each of the sections 75 15-15 of the bottom portion 11 may be readily cast or otherwise manufactured with the ordinary equipment found in foundries or other factories. The sections 15-15 of the lower portion 11 of the bell may be bolted together and slipped over S0 the upper portion 10 with the cooperating conical surfaces 18 and 19 in engagement with one another. The wedge pins 21-21 may then be driven in, wedging the top portion 10 with the bottom portion 11 into rigid relationship with one an- S5 other, after which the keys 24-24 may be driven home. The bell may then be completely machined in assembled condition, after which the parts may be dismantled and shipped to the job, where they may be readily secured ltogether within the furnace in which the bell is to be used. By reason of the present invention the lifting of heavy weights even in the use of large bells is avoided.

An advantage of the present invention is that repairs to the bell or assembly thereof are possible without completely dismantling the top. For example, if one section 15 of the bell should be burned or cracked, this section could be removed by unboltng said section from its neighboring sections and removing the Wedge pins 21-21 cooperating with that particular section. The burned or cracked section could then be dropped into the furnace and the new section to replace it could be lowered through the gas seal in a manner well understood to those skilled in blast furnace practice.

Though a preferred embodiment of the present invention has been described in detail, many modifications will occur to those skilled in the u o portion having an outwardly presented conical surface and a skirt portion having an inwardly presented conical surface bearing upon said outwardly presented conical surface, and a plurality of spaced pins extending through said upper portion, said pins having tapered heads having wedging relationship between the upper extremity pfn said lower portion and said upper portion, said pins being provided with tapered keys disposed inwardly of said bell for holding said pins in operative relationship with said portions.

vEDGAR P. EVERHARD.

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